HYDROGEN STORAGE PROPERTIES OF ScMn 2 ALLOY

48 7 Vol.48 No.7 2012 Ü 7 822 829 ACTA METALLURGICA SINICA Jul. 2012 pp.822 829 ScMn 2 Ð Ú (Æ) 1) 2) 1) 1) 1) ¾±À É Ø, Î 110016 2) Ó± ËÀ, Î 471003 Å Ò XRD Ê À ScMn 2 (Â) Ä Ðв; Ò Sieverts ±µ À ÍÄØ P C T ¹ Ð Á ¹; Ò³¼ ¹³ (TG DSC) Ê À ScMn 2H 3.6 ÝÄ Å Ð Á. Ð, ScMn 2 (Â) Ä «À C14 Laves»Ð², Ð ß 25%; ScMn 2 ÅÎ ¼Æ³ØÝ H(D) ÄÐ, Ô ÍÄØ; 100 kpa, 298 K, 1molScMn 2  3.7 3.6 mol; ScMn 2 Ü Å µ Æ Õ, Ô ĐÛÞ Ü ĐÛÆ, ËÚ H Ç. ÝÎ ĐÛÆÛ Ä ΔH ΔS 45 kj/mol 80 J/(K mol); ScMn 2 Å 113 kpa Ä H 2(D 2) ÆƳ (Â) Ð Á³Ò JMA, 0.4,  ÍÄØ (16±0.3) (19±1.7) kj/mol, ÀÍÄØ ¹  ScMn 2 ³ ØÒÚ H ; ÝÄ Ä Å 639 K Ø Å, Å ÍÄØ (144±14) kj/mol. Î ScMn 2, ÍÄ, P C T ¹, ³ Á, Ð Á Ð Ó TG139.7 Đ ËßÖ A Đ«Ê 0412 1961(2012)07 0822 08 HYDROGEN STORAGE PROPERTIES OF ScMn 2 ALLOY LI Wuhui 1), TIAN Baohong 2),MAPing 1), WU Erdong 1) 1) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 2) School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003 Correspondent: WU Erdong, professor, Tel: (024)23971952, E-mail: ewu@imr.ac.cn Supported by National Natural Science Foundation of China (Nos.51071157 and 11079043) Manuscript received 2012 02 28, in revised form 2012 05 10 ABSTRACT As an important rare earth type Laves phase compound, ScMn 2 alloy is endowed certain significance in the viewpoint of either theoretical or applicable investigation. In this study, the structures of ScMn 2 alloy and its hydride (deuteride) are characterized by XRD. The hydrogen activation properties, pressure concentration temperature (P C T) curves and absorption kinetic curves of ScMn 2 alloy are measured using Sieverts type hydrogenator. The desorption kinetics of the passivated hydride are determined by TG DSC. The results show that the hydride and deuteride of the alloy retain the C14 type Laves phase structure of the parent alloy, with the volume expansions of about 25%. ScMn 2 possesses outstanding activation properties and can react quickly with hydrogen (deuterium) at room temperature and atmospheric pressure. The hydrogen and deuterium storage capacities of 1 mol ScMn 2 are about 3.7 mol H and 3.6 mol D at 100 kpa and 298 K. ScMn 2 has low hysteresis critical temperature for absorption and desorption, good plateau characteristics and relatively low plateau pressure, hence it is suitable for the storage of hydrogen isotopes. The enthalpy and entropy for formation of ScMn 2 hydride at concentration corresponding to room temperature plateau pressure are 45 kj/mol and 80 J/(K mol), respectively. The hydriding kinetics of the alloy can be interpreted by Johnson Mehl Avrami (JMA) model, with the estimated reaction order of 0.4. The apparent activation energies for hydriding and deteuriding process are estimated to be * ²Á Ñ 51071157 11079043 µ : 2012 02 28, µ : 2012 05 10 Õ : Ë, Ô, 1969 Ý, È DOI: 10.3724/SP.J.1037.2012.00109

7 Ê :ScMn 2 (Á) 823 (16±0.3) and (19±1.7) kj/mol, respectively, the observed isotope effect on kinetics can possibly be applied to separation of hydrogen isotope. The passivated hydride can release completely at 639 K and the corresponding apparent activation energy is (144±14) kj/mol. KEY WORDS ScMn 2 alloy, hydrogen activation, pressure concentration temperature curve, thermodynamics, kinetics Ç É AB 2 Laves ¼ À ĐÍ, Ø ÎÅ Û Ì «Ñ  ٠РØÌ Õ, Á¼ Ë ÐÓ [1 5]. º¼Á, «Ó Ù ÎÅ Ù ÇØÎÅ. Ð ß Ê Ù ½. Ü È Laves ¼ ScCrMn Ë [6], Ø Õ ÎÅ Ù º Å, «²ÃÓ H ÈÞ Ø Ì «ÐÓÑ. ÐÞ ScCrMn ÜÐ Đ AB 2, ScCr 2 ÓÅ, Ø ScMn 2 Þ ScCrMn C14 Laves ¼ ³, Æ ½ a=0.5033 nm, c=0.8278 nm [7]. ÐÁ ÜÞ ScCrMn É Laves ¼ Å Ë [8], Ð Mn ««Ç «Üß. Á, Ü ScMn 2 Å Ë Ø ÙÅ Á È Laves ¼ Ù, H ÈÞ ¾ Ã. Ò Ü ScMn 2 Å Ë ÇÝ,. Kost [9] Á ScMn 2 ScMn 2 H 3.8 Å, ÜÐ Ê 2.41%( Æ ), Griessen [10] Ù À. Shilov [11] Æ Á ÀÍ Ò ScMn 2 H Ä. Ï ScMn 2 «P C T (pressure concentration temperature) º Æ, ØÜ ScMn 2 «Ñ  ÂÝ ½² Ë, ØÜ ScMn 2 Å Æ ³Þ Ð (ż Â Ð Ñ Â Ð) Ë. Á, À Ó XRD Ë Á ScMn 2 (Ã) Å ³, à (Ã) Ñ Â ºÝ Á ÎÅ Ù, Û P C T Ë Á (Ã) Ù Å Ä Ñ Â, Ó DSC TG Ë Á Å «Ñ  ŠÅ. 1 Þ ±Ó Ö Û 99.9% ¹ Sc Mn, «Ar Ã, Û ÂË 4 Ã, ³ 30 g ½ ScMn 2, ĐÃÞ ÍÁ Sc Mn Ö Ö, ±Ó IRIS Intrepid Ô» (ICP AES) Æ, Ö ÖÝ Mn À ÞРк <3%. «(Ã) «³ Sieverts «Ð ² Å. «ÃÆÀÍ : Ú ¹ 0.5 g Ù ¹ «½ Ï, ±Ó Ç H 2 Ü Ï Å À, ±À ½ Ö 99.99%, Ç 98.7 kpa H 2 Å ÎÅ, ÀÍ Ö (298±2) K; ÜÎÅÀ H 2 Ç 120 kpa ÙÀ, Ú Ð 485 K( ÖÊ Û Ö Å ) 0.5 h à Å. ±Ó 1 à «ÃÆÀ, Æ «298, 379, 406, 433, 459 485 K, 0.01 120 kpa Ç ÖÅ P C T º. Ú 7 à «ÃÆÀÍ «H 2 Ç 113 kpa Ø, Æ «379, 406, 433, 459 485 K Å Ñ Â. Ü H D Å «Ã. ÀÍ Ó H. H 2 Ç 100 kpa Ø Ê Ì 1/2 ÜÐ Ç «ÜÇ. ±Ó Rigaku D/max ra X ºÌ (XRD, CuK α ) Ü (Ã) Å ( Û 74 μm) Å XRD Æ, ¾ 0.04, ÑÏ 4 /min; Ú LHPM [12], Ì ±Ó Voigt, Ú Æ ² Đ ²² Ö Ì» Ü ². ±Ó NETZSCH STA 449F3 ½ º Æ (TG DSC) Ü Å Å DSC TG. Ó Ö 99.999% Ar Ü 0.5 h, ± À«ÉÑ Ar Ã Æ 5, 10, 15 20 K/min ÑÏÄÏ 653 K Ü Å Å Æ, ± ÓÕ Ü TG DSC Í««Å Đ Ô. 2 Þ Õ 2.1 Ñ ÙÛ ( ) 1 ScMn 2 (Ã) Å ScMn 2 H 3.6 ScMn 2 D 3.5 Rietveld Ú XRD, Ú Æ ³² ÄÛ 1. Ö 1 1, ScMn 2 Æ ³Þ Dwight [7] Æ, C14 Laves ¼ ³ ( Ó P6 3 /mmc); (Ã) À (Ã) Å Ð Æ ³, À ScMn 2 H 3.6, Æ Ð 27.7%; ÃÀ ScMn 2 D 3.5, Æ Ð 26.9%; Ê Å ÇÊà Å, Ò Ò¾, (Ã) Å ÆÒ, Æ ²Å; Ø Ì Æ È½

824 48 «ÃÆÀ, «Đà Ø, ÑÏ Å Ì, Ã Ì ÑÏ 4, ±À¾Ù, 24s Ê, «ÃÆÀ ÎÅ. ÀÍ, ScMn 2 ÃÎÅ ºÞ 2a. ScMn 2 ÞÎÅ ÙÕ ScCrMn ¼ [6], Ê ÇÊ ÓÒݾ, Ï ZrMn2 ÓØ ( 2b). ÞÓÛ H È Ho 0.6 Mn 0.4 Co 2 ¼ [13],ScMn 2 Ã Ú 1/10, Ê Ù Ó Ho 0.6 Mn 0.4 Co 2 1/7. Á, ScMn 2 ØÌ ÓÛ È ÎÅ Ù. È, ÖÛ ScMn 2 À µ ¼Þ Æ ±, «Ý Ö» Ù [14], Á, ÎÅ ß Ü ÀÆ Ã Á. Manchester [15] Á 4»ÎÅ ³: Ð ÅÅ ÏÅ Å ÏÅ 1 ScMn 2,ScMn 2 H 3.6 ScMn 2 D 3.5 XRD Fig.1 Refinement of the XRD patterns for the ScMn 2 (a), ScMn 2 H 3.6 (b) and ScMn 2 D 3.5 (c) powders ÆÐ, H(D) Đ«Æ ; ¼ Å H, ÃÅ D, Æ, Ð ÃÅ Ì» Ý, ÃÅ ÆÐ ¼ Å. 2.2 Ñ Û ÎÅÕ Ü ß ÊÓÛ H È Ùؽ Ñ. 2a ScMn 2 «H 2 Ç 98.7 kpa, 298 K ÎÅ º., «Ã, 12 s À, ÅÈ, 20s ÑÏÅÑ Ì, 26 s ÑÏ Ì, ±À¾Ù, 80 s Ê ( Ê 200 s 96%); ÏÅ. Á, ScMn 2 ÎÅ : «Ö, H 2 ŽÏÅ Å, «ÜÐ Å Å Ò ; H 2 Æ Ð Mn ÅÅÅ H Đ, ÖÁŽ Å, Å ÆÅ, Ì Ì µ, ÄÐ ÐÐÑ, Î β Å À, ÑÏ, À Û. 2.3 Ñ P C T Ü 3 ScMn 2 «Ö «(Ã) º (P C T º)., 100 kpa, 298 K, ScMn 2 Ã Æ 3.7 3.6 mol, ¼Ð Å ScMn 2 H 3.7 ScMn 2 D 3.6 ; (Ã) Õ Ö ÐÛ, 485 K ScMn 2 Ã Æ 2.5 2.4 mol; «(Ã) À Õ Ö Ð, 406 K Ö, 459 K, 459 K ÀÇ Ö, ScCrMn Å ÀÇ Ö 478 K [6] «20 K. Ä Ö «(Ã) º ¹ ScMn 2 Å ½ Üß, Þ ScCrMn [6] ¼, ScMn 2 Üß, «Sc Laves ¼ Mn Ð Ø Û «Üß. Mn Ü Üß Ó ßÆ [16] Í: «C14 Laves ¼, Đ A 2 B 2 Ó± ², ScCrMn Cr Mn Í, H Ó± Á Sc 2 Cr 2 Sc 2 CrMn  º, ¼Ð  H º, Ü. Ä 298 K 485 K, ScMn 2 H ÜÇ Ä

7 Ê :ScMn 2 (Á) 825 Table 1 Ì 1 ScMn 2,ScMn 2 H 3.6 ScMn 2 D 3.5 ĐĐ ³ Crystal structure parameters of ScMn 2,ScMn 2 H 3.6 and ScMn 2 D 3.5 derived by rietveld refinements XRD patterns Compound Cell parameter Atom Positional parameter R wp, % R B,% x y z q B iso ScMn 2 a=0.5032 nm, c=0.8253 nm, Sc 4(f) 1/3, 2/3, 0.436, 1, 1.0 17.0 7.2 c/a=1.640, V =0.1810 nm 3 Mn 2(a) 0, 0, 0, 1, 1.0 Mn 6(h) 0.829, 1.658, 1/4, 1, 1.0 ScMn 2 H 3.6 a=0.5472 nm, c=0.8908 nm, Sc 4(f) 1/3, 2/3, 0.436, 1, 1.9 11.6 2.5 c/a=1.627, V =0.2310 nm 3 Mn 2(a) 0, 0, 0, 1, 2.2 Mn 6(h) 0.835, 1.670, 1/4, 1, 2.2 ScMn 2 D 3.5 a=0.5464 nm, c=0.8884 nm, Sc 4(f) 1/3, 2/3, 0.436, 1, 1.7 10.6 2.4 c/a=1.625, V =0.2297 nm 3 Mn 2(a) 0, 0, 0, 1, 1.9 Mn 6(h) 0.835, 1.670, 1/4, 1, 1.9 Note: V cell volume, x, y, z coordinate, q site occupancy, B iso isotropic temperature factor, R wp weighted profile residual, R B Bragg residual Fig.2 2 ScMn 2 ZrMn 2 Å 298 K ÍÄ ¹ Activation curves of the ScMn 2 (a) and ZrMn 2 (b) for hydrogen absorbing at 298 K Fig.3 3 ScMn 2 Å Õ³ Å (Â)P C T ¹ Absorption (Abs.) and desorption (Des.) curves (P C T) of the ScMn 2 alloy for H (a) and D (b) at different temperatures 0.03 kpa Ð 17.1 kpa, ScMn 2 ÜÇ. ½, Æ ² Ì, ÜÇ, Æ Å. ScMn 2 ÜÇ Û ZrMn 2, Ð Æ ² Þ«[1], Sc Zr Ü H ÅÂ º ÊÚ Å º Đ. ScMn 2 Ï ÜÇ (18 Pa) Û ScCrMn(0.5 Pa) [6], ÊÖÛ, Mn Đ (r Mn =0.179 nm) Cr(r Cr =0.185 nm), Mn Í ScCrMn Cr Ö ÖÛ

826 48 Mn Cr Đ ÉÆ º Ó±, Ð Å. MnÜ H Û Cr Ü H, мРLaves ¼ ZrMn 2 ÜÇ Û ZrCr 2 ÜÇ [17]. Ó± ScMn 2 ÜÇ Û ScCrMn, Ï «ÀÇ ÖÞ Üß ÕÛ ScCrMn. Á, Ü H ÈÐÓ, ScMn 2 Ê ScCrMn Ú. 4 Ç Á H 2 Ç 100 kpa ScMn 2 (Ã) º «(Ã) ÜÇÕ Ö Å., Ï (298 K) ScMn 2 Ü H D «¼, Õ Ö, Ò, Ï D º, ÁÕ Ö, ScMn 2 º ÌÛ Ãº, º Û ; «Ã ÜÇÒÕ Ö Ì, 459 K ÜÇ ½, Á à ÜÇ Ó º Ç ¾, 485 K ¼º Ì, 2.6 kpa, ÜÇ 15.2%. VH 0.9 Ç VD 0.9 3 [18]. ÁÞ V ¼, ScMn 2 Ó À H Æ ØÕÉ. 2.4 ÑÛ ÏÝÔ Ø 5 (α+β) ¼ Å lnp eq 1/T(P eq H 2 Ç) º. H (x) ScMn 2 Å ScMn 2 H x ¼ÜÐ Ä ΔH Å ΔS 5 ÙÇ lnp eq 1/T º, Ö Van t Hoff Đ Ú Ï, ¼ 2 ÙÇ. Ö 2, ΔH ΔS Ü ÒÕ Å H ÐÐ Ì. ΔH À Ê Ñ Å ÅÂ, Þ AB 2 Å Ê, ScMn 2 Å ÐÄÕ x Ð Å Ì, Ð ÐÅ ÅÝÌ; x=1.8, ΔH 45.2 kj/mol, Þ Griessen [10] Æ 40.2 kj/mol Þ«, ÏÞ Shilov [11] Æ 63.0 kj/mol È«ÝÌ Ðº. ScMn 2 Å ΔH ScCrMn Å ΔH ( 63 kj/mol) [6], ÞÆ 5. 2.5 Ñ Û Ô ¹Ñ  ƹ ³, ÜЫ¼ Æ Å ĐÅÂ Đ½ Å½Æ Ó± α ¼ β ¼ Å ¾Ì 5 ßÙ [19], Johnson Mehl Avrami (JMA) Ñ Â [13,20] Ê Å ¾ Ì ³Ý. 6 ScMn 2 à «ÃÆ É Ý À, «113 kpa Ö (Ã) Ñ Â º., «Ö, H 2 (D 2 ) Ç Ò«Å ºÑ Û, À ÛÑÖ È, «Æ¹Ö Ê Ñ Â ; Õ Ö, Å ÜÇ. Ñ ÂÆ ±Ó JMA [21] ln[ ln(1 f(t))] = nlnt + nlnk (1) Æ, f(t) Ê ÐÆ, n Ê Avrami, t Ê Ó, k Ê ÐÑϽ. Æ (1) «Ö, ln[ ln(1 f(t))] Þ lnt ÓÈ«º, Ï Ð n. f(t) = P 0 P (t) P 0 P (2) 5 (α+β)» Ä ScMn 2 H x lnp eq 1/T ¹ Fig.5 lnp eq vs 1/T of ScMn 2 H x (P eq equilibrium pressure of H 2 ) Ì 2 H ScMn 2 H x ΔH, ΔS P eq Table 2 ΔH, ΔS and P eq for the ScMn 2 H x with different H contens (x) 4 H 2 ÆÆ 100 kpa ScMn 2 (Â) ¹ Å (Â) ĐÛÆÔ Õ Ä Fig.4 Changes of abosorption capacity of the ScMn 2 under 100 kpa H 2 and absorption/desorption plateau of the ScMn 2 with temperature (P abs pressure during absorption, P des pressure during desorption) x ΔH, kj/mol ΔS, J/Kmol P eq, Pa 0.3 43.0 68.7 11.1 0.6 44.5 74.2 12.0 0.9 44.5 75.9 14.3 1.2 44.7 77.5 16.3 1.5 45.0 78.8 17.2 1.8 45.2 80.1 18.3

7 Ê :ScMn 2 (Á) 827 Æ, P 0 Ê ÅÇ, P (t) P Æ Ê Ó t º Ç. «ÅÇ 113 kpa, α Å Ð Ó Û 1s,Á β Å Ð Ñ ΔP = P (t) P, ÁÑ ÂÆ Ê (α+β) ¼. Ð 93% Ó, Ü 160 s, à 180 s, ln[ ln(1 f)] Þ lnt (α+β) ¼ n 0.4. (α+β) ¼ Ð Û 1, «ScMn 2, β ¼ Å ¾Ì ½ ³ Ð. Ú n=0.4 Í½Æ (1), [ ln(1 f(t))]2.5 ln =lnk (3) t 7 Ç Á Ö [ ln(1 f)] 2.5 t º, Æ (3), º Ï ÐÑϽ k. Ö 7, ÐÑÏÕ Ö ÐÛ, Þ Arrhenius Æ, ÊÖÛ Ö Ì Ç, ÄÐÖ Ñ ΔP, Ð ΔP Õ Å ÚÖ Å Û ÐÑÏÙ. ±ÓÇ ½ Å [21] Å Ï ÞÇ ÑϽ k = k T (P P eq ) P eq (4) Æ, k T Þ ÖØ, ÞÇ ÑϽ, Ö Arrhenius Æ ( k T = Aexp E ) A RT (5) Æ, A Ç, E A Ç ÐÎÅÙ, R Ê «½, T Ê Â Ö. Æ (5), ln(k T ) Þ 1/T ÓÈ«º, Ö º Ï E A /R ÎÅÙ. 8 Á à ln(k T ) Þ 1/T. 8 Ú º Ï, Ò Ã ¹Î ÅÙÆ (16±0.3) (19±1.7) kj/mol. ¹ÎÅÙÞ Laves ¼ Ho 1 x Mn x Co 2 H «(α+β) ¼ ÎÅÙ (13 28 kj/mol) Ø [21].ScMn 2 6 ß ŠScMn 2 Å 113 kpa Õ³ (Â) Ð Á ¹ Fig.6 Kinetics curves of hydrogen (a) and deuterium (b) absorption for the ScMn 2 alloy after several cycles absorption/esorption at different temperatures and 113 kpa H 2 (D 2 ) Fig.7 7 ScMn 2 Å 113 kpa H 2 (D 2 ) ÆÆ Õ³  [ ln(1 f)] 2.5 Ý t [ ln(1 f)] 2.5 vs t of hydrogen (a) and deuterium (b) absorption for ScMn 2 alloy at different temperatures and 113 kpa H 2 (D 2 )

828 48 ÃÎÅÙ ÎÅÙ 19%, à ÐÑÏ. ScMn 2 «Ã ÐÑÏ º ScMn 2 Å ÓÛ H Æ. 2.6 Û Û Ô ScMn 2 Å Þ «Þ, Ì Å ÏÅ» ÏÅ, «Ù º, ÞÅ. É Î, «Ü Å Ã «. 9a ÞÅ ScMn 2 H 3.6 Æ «5, 10, 15 20 K/min ÑÏ DSC º, DSC º ÜÐ Å «. «Ð Ñ Â Ö Kissinger [22] Ö [23]. Kissinger Ó± ÓÛ Ð ÎÙ [23 25], Ï Æ Å «Î ÙÀÍ., ÞÅÀ Î «¹ÎÅÙ ÞÅ ¹ÎÅÙ «, ÞÅ À «Ñ º Ì. 10 ÞÅ ScMn 2 H 3.6 «15 K/min Ð ÑÏ «TG DSC º., «Å Ö, Å ln( β Tβ 2 )=ln AR E k E k RTβ (6) Æ, β Ð ÑÏ, T β Ð ÑÏ β ÜÐ Ö, E k «Ð ¹ÎÅÙ. Æ (6), ln(β/tβ 2) Þ 1/T β ÓÈ«º, Ï E k /R. 9a β ÜÐ T β, ¼ 9b ÙÇ ln(β/tβ 2) Þ 1/T β, Ú º Ï Ò A=1.7 10 12, E k =(144±14) kj/mol, «½ 10 ScMn 2 H 3.6 ÐÎ 15 K/min TG DSC ¹ Fig.10 TG DSC curves for ScMn 2 H 3.6 (heating rate is 15 K/min) Fig.8 8 ScMn 2  ln(k T ) Ý 1/T ln(r T ) vs 1/T of hydrogen (a) and deuterium (b) absorption for ScMn 2 alloy 9 Ðγ ScMn 2 H 3.6 DSC ¹ ln(β/tβ 2) Ý 1/T β Fig.9 DSC curves at different heating rates (a) and ln(β/tβ 2) vs 1/T β (b) of ScMn 2 H 3.6

7 Ê :ScMn 2 (Á) 829 Å ½, Å «Ð, º ½ 2.1%( Æ ). Ö 2 ScMn 2 Å ΔH ΔS «Ç 100 kpa «Ö 564 K, Ð ÞÅÀ Å «639 K Ù «, Å À ÞÅ ScMn 2 Å µ ÝÌ ÎÅ٠٠Ϋ. 3 Õ (1) ScMn 2 ØÕ ÎÅ Ù, «Ï, H 2 Ç 100 kpa, Ð Þ H 2 ÙÅ Ñ Ð, à «ÃÆ Ø Ð. Å ÃÅ Ð C14 Laves ¼ ³, Æ 25%. (2) 100 kpa, 298 K, 1molScMn 2 Ã Æ 3.7 3.6 mol, ¼ÐÅÂÆ ScMn 2 H 3.7 ScMn 2 D 3.6. «À ÐÕ Ö Ð, Ç Ö 459 K. «Üß Õ, ÜÇÝ, ÌÛ H È. ÜÐ Ü H/M=0.6, Å Ä ΔH= 45.2 kj/mol, Å ΔS= 80.1 J/(K mol), Þ ScCrMn Å Ý, ScMn 2 Šݺ. (3) ÎÅ ScMn 2, «¼ Å H 2 Ç, ÐÑÏÕ Ö ÐÖ, ÇÕ Ö Ð Ì. ÄÇ ½ Å Ã ¹ÎÅÙ Æ (16±0.3) (19±1.7) kj/mol. (4) ScMn 2 H 3.6 ÞÅÀ«673 K Ö Å Ù Î «, ÞÅÀ ScMn 2 H 3.6 «¹ÎÅÙ (144±14) kj/mol, ÛÞÅ ¹ÎÅÙ. ÍÒĐ [1] Pebler A, Gulbransen E A. Electrochem Technol, 1966; 4: 211 [2] Pourarian F, Fujii H, Wallace W E, Sinha V K, Kevin Smith H. J Phys Chem, 1981; 85: 3105 [3] Moriwaki Y, Gamo T, Iwaki T. J Less Common Met, 1991; 172: 1028 [4] Li G, Nishimiya N, Satoh H, Kamegashira N. J Alloys Compd, 2005; 393: 231 [5] Guo X M, Wu E D. J Alloys Compd, 2008; 455: 191 [6] Li W H, Wu E D. J Alloys Compd, 2012; 511: 169 [7] Dwight A E. Trans Am Soc Met, 1961; 53: 479 [8] Park J M, Lee J Y. J Less Common Met, 1991; 167: 245 [9] Kost M E, Raevskaya M V, Shilov A L, Yaropolova E I, Mikheeva V I. Russ J Inorg Chem, 1979; 24: 1803 [10] Griessen R, Driessen A, De Groot D G. J Less Common Met, 1984; 103: 235 [11] Shilov A L, Kost M E, Kuznetsov N T. J Less Common Met, 1985; 105: 221 [12] Hunter B A, Howard C J. LHPM: A Computer Program for Rietveld Analysis of X ray and Neutron Powder Diffraction Patterns, ANSTO Report, 1998 [13] Srinivas G, Sankaranarayanan V, Ramaprabhu S. Int J Hydrogen Energy, 2007; 32: 2480 [14] Von Buch F, Lietzau J, Mordike B L, Pisch A, Schmid Fetzer R. Mater Sci Eng, 1999; A263: 1 [15] Manchester F D, Khatamian D. Mater Sci Forum, 1988; 31: 261 [16] Liu B H, Kim D M, Lee K Y, Lee J Y. J Alloys Compd, 1996; 240: 214 [17] Wu E D, Li W H, Li J. Int J Hydrogen Energy, 2012; 37: 1509 [18] Hu Z L. Hydrogen Storage Materials. Beijing: Chemical Industry Press, 2002: 441 (Á Ê. Â. : ÄÁ, 2002: 441) [19] Broom D P. Hydrogen Storage Materials. London: Springer Verlag, 2011: 89 [20] Ohtani Y, Hashimoto S, Uchida H. J Less Common Met, 1991; 172 174: 841 [21] Srinivas G, Sankaranarayanan V, Ramaprabhu S. JAlloys Compd, 2008; 448: 159 [22] Kissinger H E. Anal Chem, 1957; 29: 1702 [23] Hu R Z, Shi Q Z. Thermal Analysis Kinetics. Beijing: Science Press, 2001: 1 (Á, ÁÅÆ. ³ Ð Á. : ²Á, 2001: 1) [24] Fang Y Z, Liao M S, Hu L L. Thermochim Acta, 2006; 443: 179 [25]HsiehYC,ChouYC,LinCP,HsiehTF,ShuCM. Aerosol Air Qual Res, 2010; 10: 212 ( : )